DTC P1649
DTC P1649 |
Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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DTC Descriptor |
DTC P1649
Immobilizer Security Code Not Programmed
Circuit/System Description |
When learning the security code, as well as the challenge and response sequence, the engine control module (ECM) is placed in learn mode. Once the security code and challenge/response are learned, learn mode will be exited when the engine is successfully started.
Conditions for Running the DTC |
The ECM is in learn mode.
Conditions for Setting the DTC |
The ECM has not learned a security code.
Action Taken When the DTC Sets |
The security indicator in the instrument cluster will illuminate.
Conditions for Clearing the DTC |
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A current DTC P1649 will be cleared upon a successful engine start after exit of learn mode.
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A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.
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Reference Information |
Schematic Reference
Immobilizer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References
Circuit/System Verification |
Note | ||
Because of normal system communications between the BCM and ECM, any immobilizer B-codes must be diagnosed prior to the diagnosis of P-codes. |
Perform the ECM immobilizer learn using the engine control module IMMO learn in SPS. Refer to Immobilizer system component programming . The ECM should successfully complete the learn and the vehicle should start.
Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming